Thunder Tiger Raptor 30 V2

Thunder Tiger Raptor 30 Radio Control Helicopter

May 02, 2015



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Airfield Models (http://www.airfieldmodels.com/)Building the Thunder Tiger Raptor 30 V2 Helicopter Step Eleven

 
 

Step Eleven Main Rotor Head Assembly

  • This step is on page 11 of the Instruction Manual.
This is probably the most complex step in building the Raptor.  It's not difficult but can be confusing in certain areas.  I've taken additional photos to help clarify what needs to be done.
Parts bag for this assembly. The parts bag for this assembly...
More parts bags for this assembly. which breaks down into several more parts bags.
Parts for the main rotor head assembly. Parts for the main rotor head assembly.
Grease the outside and inside of the rubber flap dampers using a non-petroleum grease. Grease the outside and inside of the rubber flap dampers using a non-petroleum grease.
Insert the flap dampers into the main rotor hub.  Slide the feathering shaft through the flap dampers. Insert the flap dampers into the main rotor hub.  Slide the feathering shaft through the flap dampers.  Get it more or less centered.
Thrust bearings. The thrust bearings are shrink wrapped because they are actually three pieces each.

The two outside bearing races are not the same size but you can't tell just by looking.  Pay attention to what you're doing here because this is the one place where it's easy to go wrong.

Check bearing size by sliding them onto the feathering shaft and wiggling them. Slide each race on the feathering shaft.  Wiggle it to find which one has a larger hole.  One of the races will wiggle much more than the other.

The race with the larger hole goes to the inside.  The race with the smaller hole goes toward the blade.

The maint rotor pitch housing and associated parts. The main rotor pitch housing and associated parts.
Slide the aluminum flap collar onto the feathering shaft.  Slide on the bearing and then the main rotor pitch housing. Slide the aluminum flap collar onto the feathering shaft.

Slide on the bearing, flybar control rods and then the main rotor pitch housing.

Parts that go inside the main rotor pitch housing shown in the order they are inserted. These are the parts that go inside the main rotor pitch housing shown in the order they are inserted.

The first part to go in is the thrust bearing.  Again, make sure the larger hole is in and the smaller hole is out.

After the bearing is inserted, slide on the thin flat washer followed by the bearing and then the tapered flat washer.  Put a small amount of Loctite only in the feathering shaft.  Thread the bolt into the end of the feathering shaft to hold it all in place.

When both main rotor pitch housings are assembled, use a hex wrench in each to tighten it all down securely. Place a hex wrench in each of the main rotor pitch housing bolts and tighten them securely.

I didn't put the flybar control rods on and had to remove the main rotor pitch housings so they could be added.

The main rotor pitch housings assembled to the main rotor hub. The main rotor pitch housings assembled to the main rotor hub.
Parts for the flybar control arm. Parts for the flybar control arm.
Slide the flybar arm bushing into the flybar control arm.  Thread the set screw in a few turns. Slide the flybar arm bushing into the flybar control arm.  Thread the set screw in a few turns.
Insert a bearing into each side of each mixing lever.  Thread two balls onto each lever. Insert a bearing into each side of each mixing lever.

Thread two balls onto each lever.

Parts to assemble to the flybar seesaw hub. Parts to assemble to the flybar seesaw hub.

Note the washers between the mixing levers and the seesaw hub.

Carefully center the flybar rod in the flybar seesaw hub. Carefully center the flybar rod in the flybar seesaw hub.
Tighten the flybar control arms to the flybar rod.  Add the mixing levers to the seesaw hub. There is flat on each side of the flybar rod for the set screws in the flybar control arms to tighten against.  Ensure they are lined up correctly before tightening them.

Check that the flybar rod is still centered.

Add Loctite to the bolts for the mixing levers and bolt the mixing levers to the seesaw hub.

The seesaw hub assembly and main rotor hub assembly. The seesaw hub assembly and main rotor hub assembly.
Add Loctite to the two bolts holding the seesaw hub to the main rotor hub and bolt these assemblies together. Add Loctite to the two bolts holding the seesaw hub to the main rotor hub and bolt these assemblies together.
A set screw threads into the front of each flybar paddle. A set screw threads into the front of each flybar paddle.
Thread the set screw in several turns. Thread the set screw in several turns.
Thread the paddles onto the flybar rod until the end of the flybar rod appears in the window cut-out in the paddle. Thread the paddles onto the flybar rod until the end of the flybar rod appears in the window cut-out in the paddle.

Measure the distance from the seesaw hub to each paddle to ensure they are exactly the same distance

The paddles are very difficult to adjust with any degree of accuracy due to the very tight fitting threads.

I suggest you thread the paddles on as far as they go and then thread them back completely off at least three times to loosen them up a little.

When you thread them on the last time apply a little sewing machine oil or grease to the threads.

The rotor head turns clockwise.  Ensure the paddles face the correct direction.

A pair of paddle pitch guages used to ensure the paddles are absolutely level with each other. A pair of paddle pitch gauges used to ensure the paddles are absolutely level with each other.  These do not come with the kit.
The paddles should be level with each other and with the swashplate when the swashplate is level. The paddles should be level with each other and with the swashplate when the swashplate is level.

This is why you need to loosen the threads.  If you don't, then when you try to make minute adjustments to the pitch of either paddle, the flybar rod will twist instead of the paddle turning.  It suddenly lets loose and the paddle ends up at some angle other than what you want.

When you are satisfied with the set up, tighten the set screws in the paddles.  Don't over-tighten them. When you are satisfied with the set up, tighten the set screws in the paddles.  Don't over-tighten them.
 
 

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Building the Raptor 30 V2 Helicopter - Step 10
Building the Raptor 30 V2 Helicopter - Step 12

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Copyright 2006 Paul K. Johnson